Study on tie rod force characteristics in electro-hydraulic power steering system for heavy vehicle

Electro-hydraulic servo steering system (EHSSS) is a key technology for heavy vehicles. The traditional EHSSS has high control accuracy but low energy efficiency. Therefore, this paper proposes a novel EHSSS based on independent metering system, which can combine high steering accuracy with high energy efficiency. Firstly, two servo-proportional valves are used to reduce the throttling loss at the meter-out orifice. The servo motor pump is used to keep the pump supply pressure at a low value. Then, to ensure high steering accuracy, a position-velocity-pressure combined control strategy is proposed for easy engineering practice. And a smooth switching strategy is proposed to achieve smooth mode switching at high frequency. Finally, the effectiveness of the proposed method is verified by experiments. The experimental comparison results show that the proposed method can achieve the same accuracy as the valve-controlled steering system with less energy, and can realize smooth mode switching.

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“…In this paper, it assumes that the system energy consumption is the input energy. The system input power P in can be described as 23 :…”

Section: Modeling and Analysismentioning

confidence: 99%

Application research of electro-hydraulic servo steering system based on independent metering system

Liu

Cai

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Waybase et al [19] found that vibration and fatigue failure were the main causes of tie rod failure. Godase et al [20] and Du et al [21] pointed out that the strength of tie rods is mainly influenced by bending, tension, load, and shear, among which the shear resistance of tie rods is often neglected. And Godase et al found that the geometric parameters of the tie rod, such as its outer diameter and inner diameter, have a significant effect on shear stress.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stress Compensation for an Aircraft Engine Duct System Based on a Structural Redesign of Tie Rods

Li,

Feng,

Yuan

et al. 2023

Applied Sciences

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The reliability of the aircraft engine duct system is of paramount importance as it directly affects the safety of the aircraft, particularly under high-temperature and high-pressure cycles. In this study, ANSYS Workbench was used for finite element analysis, and a sleeve-type tie rod structure was proposed to address the critical problem of tie rod tearing during the operation of the duct system, thereby optimizing thermal stress compensation for the duct system. The research results show the following: (1) The anchor of the traditional tie rod imposes displacement constraints on the thermal deformation of the duct system, leading to stress concentration and even structural failure in the connection area between a duct and a tie rod. (2) The improved sleeve-type tie rod provides greater axial displacement freedom for the duct, effectively mitigating stress concentration phenomena. (3) Taking a worst-case scenario of 537.78 °C and 2 MPa as an example, the sleeve-type tie rod proposed in this paper can reduce the stress at the tie rod connection from 757.61 MPa to less than 25 MPa, a reduction of more than 96%. The original tie rod tearing problem is solved, and the maximum stress of the whole duct system is reduced to 459.25 MPa, which is below the yield strength.

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Optimal Control Strategy of Electro-hydraulic Position Servo System Using Genetic Algorithm

Zhu,

Zhang,

Rao

2024

MENG

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background: The optimal control strategy has been widely used in electro-hydraulic position servo systems to achieve high-precision position tracking. However, the difficulty of selecting the weighted matrices in optimal control often leads to poor tracking accuracy. objective: This patent proposes an optimal control strategy using a genetic algorithm to improve the tracking accuracy of the electro-hydraulic servo system. methods: The patent first established the system state equation of the valve-controlled asymmetric cylinder. Secondly, based on linear quadratic optimal control theory and genetic algorithm, an optimal control strategy using a genetic algorithm was proposed. Finally, the simulation and experimental results showed that the designed controller has high position tracking accuracy. results: The optimal controller using a genetic algorithm was designed using Matlab/Simulink, and the effectiveness of the controller was verified through simulation. Additionally, experimental results showed that the proposed optimal control controller using a genetic algorithm had higher tracking accuracy than the proportional-integral-derivative controller and traditional backstepping controller for a given reference signal. conclusion: The control technology of the optimal controller using a genetic algorithm was found to be superior to proportional-integral-derivative and traditional backstepping controllers, and the tracking error of the linear quadratic regulator controller was reported to be relatively small. This demonstrated the effectiveness of the optimal control strategy using a genetic algorithm in this patent.

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Study on tie rod force characteristics in electro-hydraulic power steering system for heavy vehicle

Cited by 4 publications

References 12 publications

Application research of electro-hydraulic servo steering system based on independent metering system

Application research of electro-hydraulic servo steering system based on independent metering system

Thermal Stress Compensation for an Aircraft Engine Duct System Based on a Structural Redesign of Tie Rods

Optimal Control Strategy of Electro-hydraulic Position Servo System Using Genetic Algorithm

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